Boiler



INVENTORS Jan. J

F. A. MAEDKE ET AL BOILER Filed March 18; 1922 Patented Jan. 26, 1926.

UNITED STATES.

PATENT OFFICE.

FRANK ALBERT MAEDKE AND CARL MICHEL BAITHEL, OF PORTLAND, OREGON.

BOILER.

Application filed March 18, 1922. Serial No. 544,741.

To all whom it may concern:

Be it known that we, FRANK ALBERT MAEDKE and CARL MICHEL RAITHEL, citizens of the United States, residing at Portland, in the county of Multnoinah and State of Oregon, have invented a new and useful Boiler, of which the following is a specification. I

Our invention relates to improvements in boilers chiefly for domestic use in which a cast iron water coil is surrounded by a water jacket and in which the water is compelled to go first through the jacket before passing the coil.

The objects of our invention are to furnish a boiler which can be constructed more v cheaply market, which is more durable than the usual type of boilers, and which extracts from the burned fuel every available heat unit and therefore operates much more economically than any other type of boiler.

We attain these objects with the mechanism illustrated in the accompanying drawing which shows a boiler in elevation with parts here and there broken'away to better illustrate the interior construction.

Similar numerals refer to similar parts.

A cylindrical water jacket 1 receives its water through the pipe 2 at the bottom, and dischar es the same atthe top through the pipe 3. From thence the water flows into a pipe l at the bottom of the cast iron water coil 5. The latter has the outside appearance of a screw with double V-threads, but is, of course, hollow on the inside, and, besides, cast in one piece, which is no difficult matter since the usual dimensions taken outside the water jacket are about 26 inches in height and approximately 10 inches in diameter, giving for the water coil even slightly smaller dimensions. The water coil fits fairly closein the water jacket, so that the flame from the gas burner 6 is compelled to follow the windings of the threads and so impart heat to the water jacket as well as to the water coil until all possible heat ,has been extracted, and the products of combusthan the boilers at present in the tion escape through the flue 7 in the cover 8 on top of the water jacket.

The water, having been pre-heated in the water jacket, enters the coil and, on account of the double thread construction, is enabled to rise with great rapidity, while at the same time every particle of water is exposed to the heat of the flame as the latter circulates on the outside of the V-shaped threads.

From the water coil, the water ascends through the riser 9 to radiators or any other returns through point of use, from whence it the pipe 2, into the jacket. The base 10 furnishes the support for the boiler.

Having thus described our invention, it will be seen that our objects have been accomplished, and, though we have shown the preferred form of construction, we reserve to ourselves the right to make minor changes, providing we do not violate the spirit and principle of our invention.

We claim:

In a gas fired boiler for domestic purposes, a vertical, hollow screw with double V- shaped thread, cast integrally throughout the entire length, an axially disposed supporting pipe at the bottom of said screw and cast integrally with said screw, an axially disposed riser at the top of said screw and cast integrally with said screw, a water jacket enclosing said screw throughout the entire length, a receiving water pipe near the bottom of the water jacket, said receiving water pipe communicating with the interior of the water acket, a discharging water pipe near the top of the water jacket and on a side opposite to the receiving water pipe, said discharging water pipe communicating with the interior of the water jacket, and a connecting pipe leading from the discharging water pipe downwardly below the bottom of the water jacket to establish communication with the screw and riser through the sup porting pipe.

Signed by us at Portland, Oregon, this 13th day of March, 1922.

F. A. MAEDKE. CARL M. HAITI-TEL. 

